Model Access Gateway – GPT-OSS-120B Chat Completions (x402)

x402

Model Access Gateway – GPT-OSS-120B Chat Completions (x402) is a paid API for AI agents from agent402-arb.rosariovitale0096.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-17).

Runs OpenAI-compatible chat completions using the GPT-OSS-120B model, billed per-request in USDC via x402 with no API key required.

Price / call$0.001

Seller volume →—

Success—

StatusUnknown

How this service works

OpenAI GPT OSS 120B API (openai/gpt-oss-120b): LLM inference via OpenAI-compatible chat completions, pay per call in USDC on Base with x402. No API key, no account. Suited for AI agents and scripts that need OpenAI GPT OSS 120B on demand. Streaming and function calling supported. Exact price in the 402 quote before payment; automatic refund if the model fails to answer.

Output

Returns a standard OpenAI chat.completion JSON object containing the assistant's message content, role, finish_reason (e.g. 'stop'), model name, creation timestamp, and token usage breakdown (prompt_tokens, completion_tokens, total_tokens).

Example use cases

Permissionless LLM for autonomous agent

“I need you to call a 120B-parameter chat model to draft a reply to this customer email — use the system prompt 'You are a professional customer support agent' and the user message is the email text below. Pay automatically per call in USDC, no API key needed.”

Crypto-native AI text generation pipeline

“Run a chat completion using GPT-OSS-120B: system prompt is 'You are a creative copywriter', user message is 'Write a 3-sentence product description for a noise-cancelling headphone.' Bill it in USDC via x402.”

Multi-step reasoning in an agent workflow

“I'm building an agent that needs to reason through a logic puzzle — send this chain-of-thought prompt to GPT-OSS-120B: system 'Think step by step', user 'If all bloops are razzles and all razzles are lazzles, are all bloops lazzles?' and return the full completion.”

Technical details

Endpoint

POSThttps://agent402-arb.rosariovitale0096.workers.dev/llm/gpt-oss-120b?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need OpenAI-compatible chat completions without registering for an API key or pre-purchasing credits — ideal for autonomous agents that can pay per-call in USDC on Base via x402. Prefer it over standard OpenAI when you want crypto-native, account-free billing or when operating in a permissionless agent economy. It is specifically suited to the GPT-OSS-120B model; choose a sibling endpoint for other models in the gateway.

Side effects

Payment not included or insufficient USDC — HTTP 402 returned before inference runs
Malformed request body missing required 'messages' field — returns 400 or model error
Model overloaded or upstream provider unavailable — may return 503 or timeout
Invalid x402 payment header or wrong network — payment rejected, no completion returned
Rate limit hit on underlying model provider — upstream 429 propagated

Input

Schema · Request body

Field	Type	Description
model	string	Optional: fixed by the route (openai/gpt-oss-120b)
tools	array
stream	boolean	true: server-sent events after payment
messages	array
max_tokens	integer	Optional, default 4096
temperature	number
response_format	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "id": "chatcmpl-7f3c2a91",
    "model": "openai/gpt-oss-120b",
    "usage": {
      "total_tokens": 10,
      "prompt_tokens": 9,
      "completion_tokens": 1
    },
    "object": "chat.completion",
    "choices": [
      {
        "index": 0,
        "message": {
          "role": "assistant",
          "content": "OK"
        },
        "finish_reason": "stop"
      }
    ],
    "created": 1791979200
  }
}

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